cksum.c

MIPS下的boottloader yamon 的源代码

/************************************************************************
 *
 *  cksum.c
 *
 *  Monitor command to compute CRC32 for a given memory area.
 *  Same algorithm and polynomial as UNIX' cksum is used.
 *
 *  cksum <address> <size>
 *
 *
 * ######################################################################
 *
 * Copyright (c) 1999-2000 MIPS Technologies, Inc. All rights reserved. 
 * 
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 * America. 
 * 
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 * (in whole or in part) which is not expressly permitted in writing by MIPS 
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 * MIPS Technologies or any contractually-authorized third party reserves the 
 * right to change the information contained in this document to improve 
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 ************************************************************************/


/************************************************************************
 *  Include files
 ************************************************************************/

#include <sysdefs.h>
#include <syserror.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <shell_api.h>
#include <sys_api.h>
#include "shell.h"

/************************************************************************
 *  Definitions
 ************************************************************************/

/************************************************************************
 *  Public variables
 ************************************************************************/

/************************************************************************
 *  Static variables
 ************************************************************************/

static UINT32 crc_table[256] =
{
  0x0,
  0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B,
  0x1A864DB2, 0x1E475005, 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6,
  0x2B4BCB61, 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD,
  0x4C11DB70, 0x48D0C6C7, 0x4593E01E, 0x4152FDA9, 0x5F15ADAC,
  0x5BD4B01B, 0x569796C2, 0x52568B75, 0x6A1936C8, 0x6ED82B7F,
  0x639B0DA6, 0x675A1011, 0x791D4014, 0x7DDC5DA3, 0x709F7B7A,
  0x745E66CD, 0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039,
  0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5, 0xBE2B5B58,
  0xBAEA46EF, 0xB7A96036, 0xB3687D81, 0xAD2F2D84, 0xA9EE3033,
  0xA4AD16EA, 0xA06C0B5D, 0xD4326D90, 0xD0F37027, 0xDDB056FE,
  0xD9714B49, 0xC7361B4C, 0xC3F706FB, 0xCEB42022, 0xCA753D95,
  0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1, 0xE13EF6F4,
  0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D, 0x34867077, 0x30476DC0,
  0x3D044B19, 0x39C556AE, 0x278206AB, 0x23431B1C, 0x2E003DC5,
  0x2AC12072, 0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16,
  0x018AEB13, 0x054BF6A4, 0x0808D07D, 0x0CC9CDCA, 0x7897AB07,
  0x7C56B6B0, 0x71159069, 0x75D48DDE, 0x6B93DDDB, 0x6F52C06C,
  0x6211E6B5, 0x66D0FB02, 0x5E9F46BF, 0x5A5E5B08, 0x571D7DD1,
  0x53DC6066, 0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA,
  0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E, 0xBFA1B04B,
  0xBB60ADFC, 0xB6238B25, 0xB2E29692, 0x8AAD2B2F, 0x8E6C3698,
  0x832F1041, 0x87EE0DF6, 0x99A95DF3, 0x9D684044, 0x902B669D,
  0x94EA7B2A, 0xE0B41DE7, 0xE4750050, 0xE9362689, 0xEDF73B3E,
  0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2, 0xC6BCF05F,
  0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686, 0xD5B88683, 0xD1799B34,
  0xDC3ABDED, 0xD8FBA05A, 0x690CE0EE, 0x6DCDFD59, 0x608EDB80,
  0x644FC637, 0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB,
  0x4F040D56, 0x4BC510E1, 0x46863638, 0x42472B8F, 0x5C007B8A,
  0x58C1663D, 0x558240E4, 0x51435D53, 0x251D3B9E, 0x21DC2629,
  0x2C9F00F0, 0x285E1D47, 0x36194D42, 0x32D850F5, 0x3F9B762C,
  0x3B5A6B9B, 0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF,
  0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623, 0xF12F560E,
  0xF5EE4BB9, 0xF8AD6D60, 0xFC6C70D7, 0xE22B20D2, 0xE6EA3D65,
  0xEBA91BBC, 0xEF68060B, 0xD727BBB6, 0xD3E6A601, 0xDEA580D8,
  0xDA649D6F, 0xC423CD6A, 0xC0E2D0DD, 0xCDA1F604, 0xC960EBB3,
  0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7, 0xAE3AFBA2,
  0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B, 0x9B3660C6, 0x9FF77D71,
  0x92B45BA8, 0x9675461F, 0x8832161A, 0x8CF30BAD, 0x81B02D74,
  0x857130C3, 0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640,
  0x4E8EE645, 0x4A4FFBF2, 0x470CDD2B, 0x43CDC09C, 0x7B827D21,
  0x7F436096, 0x7200464F, 0x76C15BF8, 0x68860BFD, 0x6C47164A,
  0x61043093, 0x65C52D24, 0x119B4BE9, 0x155A565E, 0x18197087,
  0x1CD86D30, 0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC,
  0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088, 0x2497D08D,
  0x2056CD3A, 0x2D15EBE3, 0x29D4F654, 0xC5A92679, 0xC1683BCE,
  0xCC2B1D17, 0xC8EA00A0, 0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB,
  0xDBEE767C, 0xE3A1CBC1, 0xE760D676, 0xEA23F0AF, 0xEEE2ED18,
  0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4, 0x89B8FD09,
  0x8D79E0BE, 0x803AC667, 0x84FBDBD0, 0x9ABC8BD5, 0x9E7D9662,
  0x933EB0BB, 0x97FFAD0C, 0xAFB010B1, 0xAB710D06, 0xA6322BDF,
  0xA2F33668, 0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4
};


/************************************************************************
 *  Static function prototypes
 ************************************************************************/

static UINT32 
get_options(
    UINT32 argc,
    char   **argv,
    UINT32 *address,
    UINT32 *length);

static UINT32	
crc32(
    UINT8  *p,
    int	   len,
    UINT32 *crc );

/************************************************************************
 *  Implementation : Static functions
 ************************************************************************/

/************************************************************************
 *                          cksum
 ************************************************************************/
static MON_FUNC(cksum)
{
    UINT32	width;
    UINT32	address;
    UINT32	length;
    UINT32	crcval;
    UINT32	rc;

    rc = get_options( argc, argv, &address, &length );

    if( rc != OK )
        return rc;

    if (!length)
	return OK;

    rc = crc32((void *) address, length, &crcval );

    if( rc != OK )
        return rc;

    printf("cksum of memory area 0x%08X..0x%08x = 0x%08X (10'%u)\n",
		address, address + length - 1, 
		crcval, crcval);

    return OK;
}


/************************************************************************
 *                          crc32
 ************************************************************************/
static UINT32	
crc32(
    UINT8  *p,
    int	   len,
    UINT32 *crc )
{
    int	cnt = len;

    *crc = 0;

    while (cnt-- > 0)
    {
	*crc = (*crc << 8) ^ crc_table[((*crc >> 24) ^ *(p++)) & 0xff];
	
	if( (cnt % 1024) == 0 )
	{
	    if( GETCHAR_CTRLC( DEFAULT_PORT ) )
	        return SHELL_ERROR_CONTROL_C_DETECTED;
	}
    }

    while (len > 0) {
	*crc = (*crc << 8) ^ crc_table[((*crc >> 24) ^ len) & 0xff];
	len >>= 8;
    }

    *crc = ~(*crc);
    return OK;
}


/************************************************************************
 *                          get_options
 ************************************************************************/
static UINT32
get_options(
    UINT32 argc,
    char   **argv,
    UINT32 *address,
    UINT32 *length)
{
    t_shell_option decode;
    UINT32	   type;
    bool	   ok 		 = TRUE;
    bool	   address_valid = FALSE;
    bool	   length_valid	 = FALSE;
    UINT32	   i;
    UINT32	   arg;
    UINT32	   error = SHELL_ERROR_SYNTAX;

    for( arg = 1; 
	          ok && 
	          (arg < argc) && 
                  shell_decode_token( argv[arg], &type, &decode );
         arg++ )
    {
	switch( type )
	{
	  case SHELL_TOKEN_OPTION :
	    /* compare takes no options */
	    error	     = SHELL_ERROR_OPTION;
	    shell_error_data = argv[arg];
	    ok		     = FALSE;
	    break;

	  case SHELL_TOKEN_NUMBER :
	    if (!address_valid)
	    {
	      *address      = decode.number;
	      address_valid = TRUE;
	    }
	    else if (!length_valid)
	    {
	        *length      = decode.number;
		length_valid = TRUE;
	    } 
	    else
		ok = FALSE;
	    break;

	  default :
	    ok = FALSE;
	    break;
        }
    }

    if( !length_valid )
        ok = FALSE;

    return ok ?
        sys_validate_range( *address, *length, sizeof(UINT8), FALSE ) :
        error;
}



/************************************************************************
 *                          cmd stuff
 ************************************************************************/

/* Command definition for compare */
static t_cmd cmd_def =
{
    "cksum",
    cksum,
    "cksum <address> <size>",

    "Computes 32-bit CRC for the specified memory area. The CRC algorithm\n"
    "and polynomial is the same which is being used by the Unix \"cksum\"\n"
    "command.",

    NULL,
    0,
    FALSE
};

/************************************************************************
 *  Implementation : Public functions
 ************************************************************************/

/************************************************************************
 *
 *                          shell_cksum_init
 *  Description :
 *  -------------
 *
 *  Initialise command
 *
 *  Return values :
 *  ---------------
 *
 *  void
 *
 ************************************************************************/
t_cmd *
shell_cksum_init( void )
{
    return &cmd_def;
}